ST. LOUIS (KMOX) - Two of St. Louis' biggest companies -- Express Scripts and Mallinckrodt -- are reacting to their spotlight in a '60 Minutes' report on high prices for a drug that treats a rare and fatal disease in infants.

The city of Rockford, Illinois is suing both companies, claiming it was been overcharged. Criticism was especially focused on Express Scripts:

“They didn’t use their buying power, they didn’t use their clout. Their job was to go out and negotiate a lower price from the manufacturer. They didn't do it,” says Express Scripts spokesman Brian Henry. He explains what they do in these situations.

“People remember the drug daraprim, and they remember Martin Shkreli, and they remember a drug that was highly priced. What we were able to do was find a partner who was able to get a version of that drug down to $1. If there were a treatment available to drive that competition in this case, we could do something similar,” he says.